Fabricated building connecting part

The invention relates to the technical field of buildings, and provides a fabricated building connecting part which comprises a fixing mechanism, a limiting assembly, a connecting part body, a side wall plate and a top wall plate, fixing shells in the fixing mechanism are arranged on the two sides of a right-angle frame, and T-shaped holes in the surface of the side wall plate are connected to the outer sides of the right-angle frame and the fixing shells in an inserted mode; a first limiting hole and a second limiting hole are formed in the two sides of the T-shaped hole, the limiting assembly comprises a first limiting part and a second limiting part, a first transmission gear in the first limiting part is in transmission connection with the first limiting rod, and a second transmission gear in the second limiting part is in transmission connection with the second limiting rod; fixing rods are arranged on the two sides of a right-angle plate in the connecting part respectively, the two sides of each fixing